Precious metal aerogel and preparation method thereof

An aerogel and precious metal technology, applied in the field of precious metal aerogel and its preparation, can solve the problems of difficulty in obtaining nanoporous metals, fast reaction rate, etc., and achieve excellent application prospects, low cost, and good controllability.

Active Publication Date: 2018-07-20
LASER FUSION RES CENT CHINA ACAD OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For noble metal aerogels, the reaction rate is fast in the direct electroless plating process, and the metal ions are reduced to nanoparticles on the template surface before entering the template channel. It is difficult to obtain nanoporous metals with both particle and ligament structures.

Method used

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  • Precious metal aerogel and preparation method thereof
  • Precious metal aerogel and preparation method thereof
  • Precious metal aerogel and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The preparation of Au airgel comprises the following steps:

[0033] Step 1, prepare electroless nickel plating solution, take 0.2gNiCl 2 ·H 20, 5mL ethanol, 20mL deionized water, fully stir and dissolve to obtain a light green clear solution, then add 2mL ammonia water, 2mL hydrazine hydrate in turn; continue to stir to obtain an electroless nickel plating solution; use the sol-gel method to prepare evenly distributed Pd in ​​the structure The wet gel of cellulose triacetate in the catalytic activation center is immersed in the prepared chemical nickel plating solution, and the chemical plating is performed once at room temperature, and the time of chemical plating is 24 hours; until the solution changes from blue to It becomes colorless, and Ni / cellulose triacetate composite airgel is obtained, which is placed in 0.01g / mL of HAuCl 4 Carry out displacement reaction in the solution, react at room temperature for 2 days, until the airgel is no longer magnetic, and obta...

Embodiment 2

[0040] The preparation of Au airgel, according to the preparation process of the Au airgel described in implementation example 1, the difference is that the number of times of electroless Ni plating in the technical parameters is 2 times, each 24h, and each Ni plating amount is 0.2gNiCl 2 ·H 2 The content of Ni in the electroless plating solution of O, when the electroless plating solution changes from blue to colorless, replace the fresh plating solution; the specific surface area of ​​the prepared Au airgel is 218.5m 2 / g, the average pore diameter is 9.45nm.

Embodiment 3

[0042] The preparation of Au airgel, according to the preparation process of the Au airgel described in implementation example 1, the difference is that the number of times of electroless Ni plating in the technical parameters is 3 times, each 24h, and each Ni plating amount is 0.2gNiCl 2 ·H 2 Ni content in the chemical plating solution of O, when the chemical plating solution changes from blue to colorless, replace the fresh plating solution. The prepared Au airgel has a specific surface area of ​​225.2m 2 / g, the average pore diameter is 9.35nm.

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Abstract

The invention discloses precious metal aerogel and a preparation method thereof. The method comprises the steps that cellulose triacetate aerogel containing a uniformly-distributed Pd catalyst servesas a template, non-precious metal / cellulose triacetate composite aerogel is obtained by means of an electroless plating method, the non-precious metal / cellulose triacetate composite aerogel is placedin a precious metal solution for a chemical displacement reaction, and precious metal / cellulose triacetate composite aerogel is obtained; the precious metal / cellulose triacetate composite aerogel is placed in an LiOH / urea solution, the process of cellulose triacetate template removal is conducted, and nanoporous precious metal gel is obtained; the nanoporous precious metal gel is washed with deionized water; the obtained nanoporous precious metal gel is subjected to solvent exchange by using acetone; finally, the precious metal aerogel is obtained through supercritical CO2 drying. The obtainedprecious metal aerogel is even in structure and high in specific surface area and has good application prospects in the fields of hydrogen storage, fuel cells, laser inertial confinement fusion and the like.

Description

technical field [0001] The invention belongs to the field of material preparation, and relates to a noble metal airgel and a preparation method thereof. Background technique [0002] Nanostructured metal airgel is a new type of material that integrates structure and function. Density, high porosity, and continuous nanoscale structure, so it has excellent application prospects in the fields of energy storage, catalysis, heat insulation, adsorption, and sensors. In particular, noble metal aerogels with high purity and low density have great application prospects in the field of inertial confinement fusion (ICF). [0003] At present, the research and preparation of metal aerogels are still in the stage of exploration and experimentation. The current preparation methods mainly include dealloying method, self-assembly method and template method. The alloying method is also called selective corrosion, which is a method of selectively dissolving elements with more active chemica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J13/00C23C18/30C23C18/34C23C18/40C23C18/42
CPCB01J13/0091C23C18/30C23C18/34C23C18/40C23C18/42
Inventor 王朝阳周小草付志兵杨曦钟铭龙米睿袁磊
Owner LASER FUSION RES CENT CHINA ACAD OF ENG PHYSICS
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